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Here is the notification by Mailchimp of the changes:
Since launching the Expert Discount Program (formerly known as the Expert Exchange Program), dozens of Experts have landed new clients. Now, we’re making the Expert Discount Program even simpler.
On completion of their first project with an Expert, Mailchimp users get 3 months of service completely free. The size of their project doesn’t matter. Whenever it’s done, just send us a paid invoice with the Mailchimp username attached and we’ll apply the deal to their account.